Process of manufacturing tooth-brushes and bristle-holders therefor.



D. L. CHANDLER. PROCESS OF'MANUFACTURING TOOTH BRUSHES AND BRISTLE HOLDERS IHEHEFUR.

APPLICATION FILED APR.13. 1912 Patented Feb. 10, 1914.

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Original application filed May 12, 1910, Serial No. 560,808;

DANIEL L. CHANDLER, OF AYER, MASSACHUSETTS.

PROCESS OF MANUFACTURING TOOTH-BRUSHES AND BRISTLE-HOLDERS THEREFOR.

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Specification of Letters Patent.

PatentedFeb. 10, 1914.

Divided and this application filed April 13,

1912. Serial No. 690,459.

To all whom it may concern:

Be it known that I, DANIEL L. CHANDLER, a citizen of the United States, residing at Ayer, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Processes of Manufacturing Tooth -,Brushes and Bristle- Holders Therefor, of which the following is a specification.

This invention relates to an improved process of manufacturin brushes and bristle holders therefor, the su'ject matter of the invention having originally formed a part of application for Letters Patent by me Serial No. 560,808, filed May 12, 1910, Tooth brush and process of manufacturing the same, and now being made the subject matter of a separate application by reason of the action of the oflice in said case requiring the process to be divided out from the article.

The object of the invention is to provide a process for manufacturing-tooth brushes and bristle holders therefor so that the bristles cannot be accidentally disconnected from theback or body portion of the brush, and further the object of the invention is to so unite the bristles and the body portion of the brush that there will be no possibility of water or foreign substances getting in around the base of the difierent bunches of bristles and between the bristles and the body portion of the brush or between the bristles and that part which unites said bristles to the body portion of the brush.

The object of the invention, therefore, is to firmly unite the bristles and the body portion of the brush and to seal said bristles in the body portion of the brush so as to render them water tight, thus making the brush durable and hygienicin its construction. To

' attain these ends each bunch of bristles.

which together form the bristle portion of the brush, is firmly fastened to and sealed in a bristleholder of plastic material, preferably consistin of a collar, and the collar is then firmly united to the body portion of the brush and sealed therein, so that no water or lowing specification an'd articularly pointed out in the claims thereof? Referring to the drawings: Figure 1 is a plan view of the body portion of a tooth brush and handle with the bristles removed. Fig. 2 is a longitudinal section taken on line 2-2'of Fig. 1. Fig. 3 is a side elevation of a bristle holder. Fig. 4 is an underneath plan of the same. Fig. 5 is a side elevation of a bristle holder with a bunch of bristles inserted therein and projecting therethrough. Fig. 6 is a side elevation of the bristle holder with the bristles drawn up into place and a cross-pin inserted therein. Fig. 7 is an enlarged sectional elevation showing two of the bristle holders in posi-' tion with the bristles therein, one of said bristle holders being shown in section.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 10 is the body or back portion of the brush and 11 the handle thereof. The body portion of the brush is provided with holes 12, 12 which preferably extend part way through said body portion, these holes being provided for the purpose of receiving the bristle holders 13, 13. The bristle'holders 13 are each provided with a hole 14 extending therethrough and also with a transverse groove 15 extending across the bottom thereof. It will be noted that the handle and back of the tooth brush and also the holders are formed of plastic material,

such as celluloid, and that the holders are The bunches of bristles 16 are attached to the bristle holders 13 in the following manner: A bunch of bristles is first doubled longitudinally thereof and pushed through the hole 14 in the holder 13 and downwardly below the bottom of said holder, as illustrated in Fig. 5. It will be noted that the holes 14, 14 are drilled in the holders 13 of the right size to have the bunch of bristles when doubled fill the hole. After the bunch of bristles has been doubled and passed through the hole in the collar or holder, as illustrated in Fig. 5, a cross-pin 17 also of celluloid, is passed through the bunch of bristles inside the folded end thereof and within the cross groove 15. The collar and that portion of the bristles which extends down below said collar, together with the pin 17, are then dipped into liquid celluloid,

collodion, or any other suitable'sealing material, and the bristles are then drawn up into the collar tight, so as to leave the collar and the bristles in the form shown in Fig. 6. The collar is then compressed by a suitable compressing tool or pincers, while hot, so as to slightly reduce the outside diameter, and also so as to close the bristles up firmly within the collar, so that the bristles, with the liquid celluloid, will fill the hole and hermetically seal the same against any liquid passing therethrough. After the. collars have had the bristles attached to them and sealed therein in the manner hereinbefore set forth, they are dipped in a mixture of alcohol and ether, which mixture slightly softens the collars until they become plastic under the action thereof. These collars and their bristles in a plastic state are then forced into the holes 12 in the brush and allowed to dry and set, whereupon the bristles will become hermetically sealed in the collars and the collars will be firmly at tached to and hermetically sealed in the brush back, the result being that no substance of any kind can get in back of the bristles and between the bristles and their respective holders; neither can water or any foreign substance get in between the collars and the back of the brush.

It will be evident that'the collars, after they have dried and set, as hereinbefore set forth, will firmly hold the bristles in the brush back or body portion and the bristles also will be firmly held to their respective collars, not only by the sealing of the same, as hereinbefore described, but by the crosspin 17 which looks the bristles within the collar, so that they cannot be removed therefrom.

' them doubled end first through a hole in said holder until said doubled end projects through said holder, then dipping the bristles in liquid celluloid and then drawing them back until said doubled end is within said holder.

2. The herein described improvement in the art of attaching bristles to bristle holders which consists in first doubling a bunch of bristles longitudinally thereof and pushing them doubled end first through a 11 1e in said holder, then passing a locking pin through thebunch of bristles within the doubled portion and at one end of the holder, then dipping the doubled end of the bunch of bristles in liquid celluloid, and then drawing said bunch of bristles back until said doubled end is within said holder.

3. The herein described improvement in the art of attaching bristles to bristle holders whichconsists in first doubling a bunch of bristles-longitudinally thereof and pushing them doubled end first through a hole in said holder until said doubled end projects through said holder, then dipping the bristles in liquid celluloid, then drawing them back until said doubled end is within said holder, and then compressing said holder while the same is heated.

4. The herein described process of manufacturing brushes which consists in first inserting a series of bunches of bristles a plurality of celluloid holders and dipping said holders and bristles in liquid celluloid and allowing them to set, then compressing said holders while heated, then subjecting said holders to a mixture of alcohol and ether until they become plastic, and then forcing said holders into a series of recesses in the body portion of said brush and allow ing them to set therein.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

DANIEL L. CHANDLER.

Witnesses:

DANIEL CHESTER PARSONS, PATRICK J. BEATTY. 

